Solar Extreme Ultraviolet Irradiance During Solar Cycle Minimum

Computer Science – Sound

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7507 Chromosphere, 7536 Solar Activity Cycle (2162), 7538 Solar Irradiance, 7549 Ultraviolet Emissions, 7594 Instruments And Techniques

Scientific paper

There have been very few measurements of the solar cycle minimum irradiance in the extreme ultraviolet (EUV: 1- 120 nm) range. The solar activity is currently very low, perhaps at the solar cycle minimum this spring, and the solar EUV irradiance for these conditions will be measured by satellite instruments and a sounding rocket payload. The satellite instruments are aboard NASA's Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) and Solar Radiation and Climate Experiment (SORCE) satellites. The NASA 36.240 sounding rocket payload is being launched from White Sand Missile Range in April 2008 to provide an underflight calibration for the satellite instruments. The primary instrument on the rocket payload is the prototype EUV Variability Experiment (EVE) that will measure the solar irradiance from 0.1-105 nm with 0.1 nm resolution. The other rocket instrument is the prototype X-Ray Photometer System (XPS), similar to the flight versions on TIMED and SORCE. This rocket XPS has been modified to contain X-ray channels with the same bandpasses as the GOES X-ray Sensor (XRS). While the primary goal of this rocket launch is to provide a underflight calibration for TIMED Solar EUV Experiment (SEE), the other important goal is to obtain the most accurate solar EUV irradiance spectrum during solar cycle minimum. This solar minimum irradiance measurement will also contribute to the April 2008 Whole Heliosphere Interval (WHI) campaign titled "Characterizing the Energetics and Dynamics of the Quiet Sun" (lead: Scott McIntosh).

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